Mix flour, cornmeal and salt; cut in shortening thoroughly.
Sprinkle in water, tossing with fork until all flour is moistened and pastry cleans side of bowl.
Gather pastry into a ball. [Divide into halves.]
Press pastry [each half] firmly against bottom and side of 10-oz quiche dish or custard cup [two 10-oz quiche dishes or custard cups].
Prick bottom and side thoroughly with fork.
Place dish[es] on inverted saucer[s] in microwave oven.
Microwave uncovered on high (550 watts) 1 min [2 min]; rotate dish[es] 1/2 turn.
Prick any bubbles with fork.
Microwave uncovered until pastry appears dry and flaky, 1 to 2 min [1 1/2 to 3 min].